气候变化领域集成服务门户(CCPortal): Fluctuation history of the interior East Antarctic Ice Sheet since mid-Pliocene

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DOI	10.1017/S0954102007000910
	Fluctuation history of the interior East Antarctic Ice Sheet since mid-Pliocene
	Huang, Feixin; Liu, Xiaohan; Kong, Ping; Fink, David; Ju, Yitai; Fang, Aimin; Yu, Liangjun; Li, Xiaoli; Na, Chunguang
通讯作者	Huang, FX (通讯作者)
发表日期	2008
ISSN	0954-1020
EISSN	1365-2079
起始页码	197
结束页码	203
卷号	20 期号:2
英文摘要	Cosmogenic Be-10 and Al-26 measurements from bedrock exposures in East Antarctica provide indications of how long the rock surface has been free from glacial cover. Samples from the crests of Zakharoff Ridge and Mount Harding, two typical nunataks in the Grove Mountains, show minimum Be-10 ages of 2.00 +/- 0.22 and 2.30 +/- 0.26 Ma, respectively. These ages suggest that the crests were above the ice sheet at least since the Plio -Pleistocene boundary. Adopting a 'reasonable' erosion rate of 5-10 cm Ma(-1) increases the exposure ages of these two samples to extend into the mid-Pliocene. The bedrock exposure ages steadily decrease with decreasing elevation on the two nunataks, which indicates similar to 200 m decrease of the ice sheet in the Grove Mountains since mid-Pliocene time. Seven higher elevation samples exhibit a simple exposure history, which indicates that the ice sheet in the Grove Mountains decreased only similar to 100 in over a period as long as 1-2 Ma. This suggests that the East Antarctic Ice Sheet (EAIS) was relatively stable during the Pliocene warm interval. Five lower elevation samples suggest a complex exposure history, and indicate that the maximum subsequent increase of the EAIS was only 100 in higher than the present ice surface. Considering the uncertainties, their total initial exposure and subsequent burial time could be later than mid-Pliocene, which may not conflict with the stable mid-Pliocene scenario.
关键词	CENOZOIC GLACIAL HISTORY GROVE MOUNTAINS SIRIUS GROUP COSMOGENIC NUCLIDES PRODUCTION-RATES ROSS EMBAYMENT EXPOSURE AGES DRY-VALLEYS DEGLACIATION EROSION
英文关键词	bedrock; cosmogenic; exposure age; Grove Mountains; stable
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography ; Geology
WOS类目	Environmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000254926000010
来源期刊	ANTARCTIC SCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257569
推荐引用方式 GB/T 7714	Huang, Feixin,Liu, Xiaohan,Kong, Ping,et al. Fluctuation history of the interior East Antarctic Ice Sheet since mid-Pliocene[J]. 中国科学院青藏高原研究所,2008,20(2).
APA	Huang, Feixin.,Liu, Xiaohan.,Kong, Ping.,Fink, David.,Ju, Yitai.,...&Na, Chunguang.(2008).Fluctuation history of the interior East Antarctic Ice Sheet since mid-Pliocene.ANTARCTIC SCIENCE,20(2).
MLA	Huang, Feixin,et al."Fluctuation history of the interior East Antarctic Ice Sheet since mid-Pliocene".ANTARCTIC SCIENCE 20.2(2008).